I did take LaTeX notes for most courses on my math degree, and I passed all of them. In fact, the ones where I dedicated more time to the notes were the ones that I could study more easily as I put in more effort to understand and review what I wrote.

> Because it's very much an edge case and he hasn't passed yet.

I am fairly sure he passed more than one course with this approach. The blogpost says that he started using LaTeX to take notes during his second semester. The screenshots show introductory complex analysis, which is usually taught somewhat later.

Don't you think you could be an edge case too where you went back and studied extra and experimented? Very few college students I know actually did anything like this, and I know I didn't. Obviously it would have helped, but I did not do that then.